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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Swedenborgite-type cobaltites and ferrites: Tetrahedral frameworks with exceptional magnetic properties
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Swedenborgite-type cobaltites and ferrites: Tetrahedral frameworks with exceptional magnetic properties

机译：瑞典硼铁矿型钴和铁氧体：具有卓越磁性的四面体骨架

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摘要

Swedenborgite-type cobaltites and ferrites and derivatives, represent a very important class of oxides, LnBaM_4O_7 and CaBaM _4O_7 (M = Co, Fe). They are one of the rare families of mixed valent transition metal oxides, where the transition element exhibits exclusively the tetrahedral coordination. Their complex crystal chemistry, involving closely related structures with various symmetries (orthorhombic, hexagonal cubic) and possibility of oxygen "hyperstoichiometry", leading to LnBaM_4O_(7+δ) oxides is described herein, as well as their ability to exhibit structural transitions vs. temperature. It is also shown that the triangular geometry of these new strongly electron correlated systems, plays an important role in their physics, particularly in the competition that appears between the 1D magnetic ordering and the 2D magnetic frustration. The generation of new magnetodielectric properties for CaBaCo_4O_7 is also emphasized.
机译：瑞典硼铁矿型钴酸盐和铁氧体及其衍生物代表非常重要的一类氧化物，即LnBaM_4O_7和CaBaM_4O_7（M = Co，Fe）。它们是混合价过渡金属氧化物的稀有族之一，其中过渡元素仅表现出四面体配位。本文描述了它们复杂的晶体化学，涉及具有各种对称性（斜方晶，六方立方）的紧密相关的结构以及可能的氧“超化学计量学”，导致LnBaM_4O_（7 +δ）氧化物，以及它们表现出结构转变的能力。温度。还表明，这些新的强电子相关系统的三角形几何形状在其物理过程中，特别是在一维磁有序和二维磁挫折之间出现的竞争中，起着重要作用。还强调了CaBaCo_4O_7的新的磁电特性的产生。

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